/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Selections/GeometrySelectionUtil.h
it is not necessarily the case that all vertices of triangles in TrianglesOut will be in VerticesOut.
false if the MeshSelection topology type is not Triangle and true otherwise
namespace UE { namespace Geometry { bool UE::Geometry::ConvertTriangleSelectionToOverlaySelection ( const [UE::Geometry::FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) & Mesh, const [FGeometrySelection](API\Plugins\DynamicMesh\Selections\FGeometrySelection) & MeshSelection, [TSet](API\Runtime\Core\Containers\TSet)< int > & TrianglesOut, [TSet](API\Runtime\Core\Containers\TSet)< int > & VerticesOut ) } }